code: def test_push_model_ids_info(self, start_serve_with_context):
      async def model_load_func(model_id: str):
          return model_id
  
      multiplexer = _ModelMultiplexWrapper(
          model_load_func, None, max_num_models_per_replica=1
      )
      stop_model_ids_pusher_thread(multiplexer)
      assert multiplexer._push_multiplexed_replica_info is False
      multiplexer._push_multiplexed_replica_info = True
      multiplexer._push_model_ids_info()
      assert multiplexer._push_multiplexed_replica_info is False
  
imports: import asyncio
  import os
  from typing import List
  import pytest
  import requests
  import ray
  from ray import serve
  from ray._private.test_utils import SignalActor, wait_for_condition
  from ray._private.utils import get_or_create_event_loop
  from ray.serve._private.constants import SERVE_MULTIPLEXED_MODEL_ID
  from ray.serve.context import _get_internal_replica_context
  from ray.serve.handle import RayServeHandle
  from ray.serve.multiplex import _ModelMultiplexWrapper
label_desc: Use image node_id 2 for calling the TestMultiplexWrapper obj's underlying member method code with example usage: obj.test_push_model_ids_info(start_serve_with_context) and returns: model_id